143521

Appears in sequences

• Number A(n,k) of endofunctions on [n] such that no element has a preimage of cardinality k; square array A(n,k), n>=0, k>=0, read by antidiagonals.at n=52A245405
• Number of endofunctions on [n] such that no element has a preimage of cardinality two.at n=7A245406